Homogeneous precipitation of thorium oxalate: Structural, kinetic, and morphological aspects

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10491196" target="_blank" >RIV/00216208:11310/25:10491196 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iRCt0Up1u2" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iRCt0Up1u2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnucmat.2024.155574" target="_blank" >10.1016/j.jnucmat.2024.155574</a>

Result language

angličtina

Original language name

Homogeneous precipitation of thorium oxalate: Structural, kinetic, and morphological aspects

Original language description

Thorium oxalate hexahydrate, Th(C2O4)2 . 6H2O was produced by homogeneous precipitation from a thorium nitrate solution through the decomposition of oxamic acid (NH2COCOOH). Typically, lanthanide oxalates and actinide oxalates are prepared by heterogeneous precipitation using oxalic acid (COOH)2. However, in the present homogeneous precipitation reaction, oxalic acid was slowly generated by the acid-catalyzed hydrolysis of oxamic acid. While heterogeneous precipitation is rapid and typically yields small microcrystals, the slow generation of the precipitation agent (oxalic acid) during homogeneous precipitation resulted in the formation of large thorium oxalate crystals with atypical morphology. The reaction exhibited first-order kinetics and was assessed at 443, 453 and 463 K (70, 80, 90 °C). The morphology of crystals obtained at these different temperatures were investigated. Additionally, the sensitivity of thorium oxalate hexahydrate to drying conditions and its decomposition during calcination to ThO2 were examined. Thorium oxalate hexahydrate tends to lose crystalline water, resulting in transition phases toward the dihydrate when dried under vacuum at 313 K (40 °C). This loss of crystalline water was not observed when drying was performed under ambient conditions. The further decomposition of the oxalate dihydrate to ThO2 followed the well-known decomposition path. The developed reaction is affordable, convenient, and does not require demanding apparatus, making it a versatile preparation route for various thorium oxalate crystals of variable morphology suitable for crystallographic studies or applications demanding powders with large particle sizes.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Nuclear Materials

ISSN

0022-3115

e-ISSN

1873-4820

Volume of the periodical

605

Issue of the periodical within the volume

February

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

155574

UT code for WoS article

001394601500001

EID of the result in the Scopus database

2-s2.0-85212924324